Aluminum base sintered material

Abstract

Disclosed is an aluminum base sintered material, in which said material comprises base powders 2 of an aluminum or an alloy thereof and numerous endless passages being formed by pores connected to each other, said pores intervening between said base powders 2 adjacent to each other, and in which said material is provided with bridging portions 3 for interconnecting said base powders 2 adjacent to each other, said bridging portions 3 having therein an eutectic structure with a hyper-eutectic compounds and with a containment of the eutectic element and the balance of aluminum.

What is claimed is: 
     
       1. A porous aluminum base sintered material, in which said material is prepared by sintering base powders of aluminum or an alloy thereof to form pores intervening between particles of said base powder adjacent to each other, wherein said base powder particles adjacent to each other are interconnected by bridging portions, each of said bridging portions contains aluminum and an eutectic element enabling formation of an eutectic structure with aluminum with the content of said eutectic element exceeding an eutectic point of the equilibrium diagram of an aluminum-eutectic element system. 
     
     
       2. A porous aluminum base sintered material as claimed according to the claim 1, wherein said eutectic element contains at least one element selected from the group consisting of silicon exceeding 11.7% (not included), manganese ranging from 2.0% (not included) to 25.3%, or copper ranging from 33.0% (not included) to 52.5% of copper. 
     
     
       3. A porous aluminum base sintered material as claimed according to the claim 1, wherein said bridging portion has therein a hyper-eutectic texture, in which said texture is provided at a center area thereof with a core consisting mainly of the intermetallic compound resulted by chemical reaction of said eutectic element with aluminum, and in which said texture is provided at an area thereof surrounding said center area with the eutectic texture consisting mainly of the aluminum crystal and the eutectic element crystal.